File.



A. VERNAZ.'

FILE.

APPLICATION FILED AUG.13, 1910.

1,042,728. atenta 001;. 29, 1912.

FIG-1 FIG 2 FIG FlG.4

FIG.

IMQ/[WIK l Wvrsfe 7721/671 707* COLUMBIA PLANOGRAPH co., WASHINGTON. D. c.

A. VERNAZ.

PILE.

APPLICATION FILED AUG. 13, 1910.

5 i 'ml FIGQ FIG. g

BEIGE.

ALEXIS VEBNAZ, 0F GENEVA, SWITZERLAND.

FILE.

Specification of Letters Patent.

Patented Oct. 29, 1912.

Application filed August 13, 1910. Serial No. 577,020.

To uZZ fra/wm, t may concern Be it known that I, ALEXIS VERNAZ, a citizen of the French Republic, residing at Geneva, in Switzerland, have invented certain new and useful Improvements in Files, of which the following is a specification.

This invention relates to improvements in tiles, composed of a core of softer metal such as iron and a facing on one or both sides of steel and consists of a tile the teeth of which are formed by stamping, so as to produce cutting surfaces which may be considered as composed of straight, undulating or zigzag lines which however are broken by a number of comparatively small projections for the purpose of preventing any lateral slip of the tool during use. The act of stamping these teeth brings t-he steel into more intimate connection with the iron core or base, the iron being extended or indented by the stamping operation when the cutting surface is formed in the steel, which is effected before tempering the same.

The annexed drawings illustrate by way of example various forms of construction of the improved file.

Figure l is a partial section of a bimetallic strip before being stamped to form the toothed cutting surface. F ig. 2 is a partial section showing on the left hand side a bimetallic strip the upper portion of which has been provided with teeth by stamping as hereinbefore indicated, the lower portion, that is to say, the part of softer metal being shown indented by said stamping operation. The right hand side of the figure shows a similar strip except that the bottom face of the lower portion of softer metal has been kept fla-t. Fig. 3 is a partial section show ing a metallic strip formed of two parte of steel and one of iron, the latter lying in the center. Fig. 4 is a partial section showing a form of construction obtained from the metallic strip shown in Fig. 8 the upper and lower cutting surfaces being simultaneously formed by means of superposed stamping tools or the like. Figs. 5 to 10 are detail plan views illustrating various cutting surfaces, the teeth of all of which in front of the cutting part are provided with numerous small and closely placed projections. The arrows indicate the direction of use of the respective tool for the filing operation. In Figs. 5 and 6 the rows of teeth are arranged in herring bone fashion. Figs. 7, S and l0 show the teeth arranged in undulating lines. Fig. 9 shows a file with inclined or diagonal teeth provided with the small proj ect-ions of rectangular form.

In the drawing a; may be taken to indicate steel and f to indicate iron.

In the examples described above the general line of the teeth is broken by the closely placed and numerous projections above referred to.

Vfhat I claim as my invention and desire to secure by Letters Patent of the United States is A file formed of welded strips of hard and relatively softer metals, the surface of the former having stamped cutting teeth and the adjacent surfaces of the metals having int-erfitting indentations, substantially as described..

In witness whereof I have signed this specification in the presence of two witnesses.

L. H. MUNIER, GHS. HUMBERT.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

